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Large-eddy simulation of the influence of a wavy lower boundary on the turbulence kinetic energy budget redistribution
- Chinese Journal of Oceanology and Limnology Vol. 36, Issue 4, Pages: 1178-1188(2018)
- Affiliations：
1.Ocean College, Zhejiang University, Zhoushan 316000, China
2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
- Author bio：
FAN Wei, fanwei@zju.edu.cn
- Funds：
DOI：10.1007/s00343-018-7015-y
CLC：Received：07 April 2017，
Accepted：12 June 2017，
Online First：13 July 2017，
Published：2018-07
- Accepted：
Scan QR Code
Zongze LU, Wei FAN, Shuang LI, et al. Large-eddy simulation of the influence of a wavy lower boundary on the turbulence kinetic energy budget redistribution[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(4): 1178-1188.
Zongze LU, Wei FAN, Shuang LI, et al. Large-eddy simulation of the influence of a wavy lower boundary on the turbulence kinetic energy budget redistribution[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(4): 1178-1188. DOI： 10.1007/s00343-018-7015-y.
摘要
Abstract
Oceanic turbulence plays an important role in coastal flow. However
as the effect of an uneven lower boundary on the adjacent turbulence is still not well understood
we explore the mechanics of nearshore turbulence with a turbulence-resolving numerical model known as a large-eddy-simulation model for an idealized scenario in a coastal region for which the lower boundary is a solid sinusoidal wave. The numerical simulation demonstrates how the mechanical energy of the current is transferred into local turbulence mixing
and shows the changes in turbulent intensity over the continuous phase change of the lower topography. The strongest turbulent kinetic energy is concentrated above the trough of the wavy surface. The turbulence mixing is mainly generated by the shear forces; the magnitude of shear production has a local maximum over the crest of the seabed topography
and there is an asymmetry in the shear production between the leeward and windward slopes. The numerical results are consistent with results from laboratory experiments. Our analysis provides an important insight into the mechanism of turbulent kinetic energy production and development.
关键词
Keywords
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